# CVE-2026-81525

## Summary

- **CVE ID:** CVE-2026-81525
- **Severity:** HIGH
- **CVSS Score:** 8.6 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-943
- **Published:** Aug 27, 2026
- **Last Modified:** Aug 28, 2026

## Description

The MongoDB client library for PHP does not sufficiently sanitize special elements in application-supplied namespace identifiers before using them to construct the target namespace for database operations. An application that incorporates untrusted text into these identifiers may have operations silently directed at a different storage location than the one the application intended.

## Affected Products

- MongoDB — PHP Driver (1.0.0)
- MongoDB — PHP Library (0)
- MongoDB — PHP Library (2.0.0)
- MongoDB — PHP Extension (0)
- MongoDB — PHP Extension (2.0.0)

## References

- [CNA](https://github.com/mongodb/mongo-php-library/releases/tag/2.4.1)
- [CNA](https://github.com/mongodb/mongo-php-driver/releases/tag/1.21.7)
- [CNA](https://jira.mongodb.org/browse/PHPLIB-1927)
- [CNA](https://github.com/mongodb/mongo-php-library/releases/tag/1.21.4)
- [CNA](https://github.com/mongodb/mongo-php-driver/releases/tag/1.21.6)
- [CNA](https://github.com/mongodb/mongo-php-driver/releases/tag/2.4.1)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.27%
- **EPSS Percentile:** 19.4

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._